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Keyboard problems: malfunctioning and scratched keys

The letter J on my MacBook Pro keyboard only works if I press it, hard, a number of times. Admittedly the keyboard hasn't been cleaned in a while: could this be the reason why the key fails, or is there some other cause?

Also, at least four of the keys' (the letters E, A, M & C) surfaces are almost entirely etched off; this is surprising, given my MBP is only 18 months old, no?
 
sad I’m concerned
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